Miscellaneous national parks legislation [electronic resource] : hearing before the Subcommittee on National Parks of the Committee on Energy and Natural Resources, United States Senate, One Hundred Tenth Congress, second session, on S. 662, S. 827, S. 923 S. 956, S. 2073, S. 2513, S. 2604, S. 2804, H.R. 53, H.R. 1483, H.R. 1528, April 23, 2008

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